/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.curator.framework.imps;

import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Executor;
import org.apache.curator.RetryLoop;
import org.apache.curator.drivers.OperationTrace;
import org.apache.curator.framework.api.*;
import org.apache.curator.framework.api.BackgroundCallback;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.framework.api.CuratorEventType;
import org.apache.curator.framework.api.SetACLBuilder;
import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Stat;

public class SetACLBuilderImpl
        implements SetACLBuilder, BackgroundPathable<Stat>, BackgroundOperation<String>, ErrorListenerPathable<Stat> {
    private final CuratorFrameworkBase client;

    private ACLing acling;
    private Backgrounding backgrounding;
    private int version;

    SetACLBuilderImpl(CuratorFrameworkBase client) {
        this.client = client;
        backgrounding = new Backgrounding();
        acling = new ACLing(client.getAclProvider());
        version = -1;
    }

    public SetACLBuilderImpl(CuratorFrameworkBase client, Backgrounding backgrounding, List<ACL> aclList, int version) {
        this.client = client;
        this.acling = new ACLing(client.getAclProvider(), aclList);
        this.version = version;
        this.backgrounding = backgrounding;
    }

    @Override
    public BackgroundPathable<Stat> withACL(List<ACL> aclList) {
        acling = new ACLing(client.getAclProvider(), aclList, false);
        return this;
    }

    @Override
    public ACLable<BackgroundPathable<Stat>> withVersion(int version) {
        this.version = version;
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground() {
        backgrounding = new Backgrounding(true);
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground(Object context) {
        backgrounding = new Backgrounding(context);
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground(BackgroundCallback callback) {
        backgrounding = new Backgrounding(callback);
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground(BackgroundCallback callback, Object context) {
        backgrounding = new Backgrounding(callback, context);
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground(BackgroundCallback callback, Object context, Executor executor) {
        backgrounding = new Backgrounding(client, callback, context, executor);
        return this;
    }

    @Override
    public ErrorListenerPathable<Stat> inBackground(BackgroundCallback callback, Executor executor) {
        backgrounding = new Backgrounding(client, callback, executor);
        return this;
    }

    @Override
    public Pathable<Stat> withUnhandledErrorListener(UnhandledErrorListener listener) {
        backgrounding = new Backgrounding(backgrounding, listener);
        return this;
    }

    @Override
    public Stat forPath(String path) throws Exception {
        String fixedPath = client.fixForNamespace(path);
        List<ACL> aclList = acling.getAclList(fixedPath);
        client.getSchemaSet().getSchema(path).validateGeneral(path, null, aclList);

        Stat resultStat = null;
        if (backgrounding.inBackground()) {
            client.processBackgroundOperation(
                    new OperationAndData<String>(
                            this, fixedPath, backgrounding.getCallback(), null, backgrounding.getContext(), null),
                    null);
        } else {
            resultStat = pathInForeground(fixedPath, aclList);
        }
        return resultStat;
    }

    @Override
    public CuratorEventType getBackgroundEventType() {
        return CuratorEventType.SET_ACL;
    }

    @Override
    public void performBackgroundOperation(final OperationAndData<String> operationAndData) throws Exception {
        try {
            final OperationTrace trace =
                    client.getZookeeperClient().startAdvancedTracer("SetACLBuilderImpl-Background");
            String path = operationAndData.getData();
            client.getZooKeeper()
                    .setACL(
                            path,
                            acling.getAclList(path),
                            version,
                            new AsyncCallback.StatCallback() {
                                @SuppressWarnings({"unchecked"})
                                @Override
                                public void processResult(int rc, String path, Object ctx, Stat stat) {
                                    trace.setReturnCode(rc)
                                            .setPath(path)
                                            .setStat(stat)
                                            .commit();
                                    CuratorEvent event = new CuratorEventImpl(
                                            client,
                                            CuratorEventType.SET_ACL,
                                            rc,
                                            path,
                                            null,
                                            ctx,
                                            stat,
                                            null,
                                            null,
                                            null,
                                            null,
                                            null);
                                    client.processBackgroundOperation(operationAndData, event);
                                }
                            },
                            backgrounding.getContext());
        } catch (Throwable e) {
            backgrounding.checkError(e, null);
        }
    }

    private Stat pathInForeground(final String path, final List<ACL> aclList) throws Exception {
        OperationTrace trace = client.getZookeeperClient().startAdvancedTracer("SetACLBuilderImpl-Foreground");
        Stat resultStat = RetryLoop.callWithRetry(client.getZookeeperClient(), new Callable<Stat>() {
            @Override
            public Stat call() throws Exception {
                return client.getZooKeeper().setACL(path, aclList, version);
            }
        });
        trace.setPath(path).setStat(resultStat).commit();
        return resultStat;
    }
}
